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Make an idea click.
Move beyond an answer. Explore visual reasoning puzzles and interactive challenges across all 6 subjects, with instant rule-based verification and step-by-step explanations.
What belongs in each mystery box?
Every mystery box holds the same value. Make the two sides balance.
0 of 7 challenge types explored at this stage
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Turn a little understanding into a fresh page of practice.
Streaks count different challenges solved consecutively in this session and reset after an incorrect check. Repeating a solved question adds no points. Original rule-based practice. Age bands are guidance, not an assessment or curriculum certification.
Practise by subject and stage.
Find the coefficient of x^3 in the binomial expansion of (x + 4)^5.
Use combinations C(n, r) and powers to find specific coefficients in the binomial expansion of (x + k)ⁿ.
0 of 4 solved in this round
Featured, challenges & worksheets in Maths
Pythagoras: hypotenuse
Calculate the hypotenuse of a right-angled triangle from two perpendicular side lengths.
Right-triangle trigonometry (SOHCAHTOA)
Apply sine, cosine and tangent ratios (SOHCAHTOA) in right-angled triangles and simplify to lowest terms.
Circle theorems & cyclic quadrilaterals
Apply circle theorems for the angle at the centre (2× circumference angle) and opposite angles in a cyclic quadrilateral.
Stationary & turning points of curves
Set the first derivative dy/dx = 0 to locate the stationary point or minimum turning value of a quadratic curve.